- MySQL is open source software which is available at any time and has no cost involved.
- MySQL is portable
- GUI with command prompt.
- Administration is supported using MySQL Query Browser
Differentiate between FLOAT and DOUBLE ?
Following are differences for FLOAT and DOUBLE:
• Floating point numbers are stored in FLOAT with eight place accuracy and it has four bytes.
• Floating point numbers are stored in DOUBLE with accuracy of 18 places and it has eight bytes.
Differentiate CHAR_LENGTH and LENGTH ?
CHAR_LENGTH is character count whereas the LENGTH is byte count. The numbers are same for Latin characters but they are different for Unicode and other encodings.
What is the usage of ENUMs in MySQL?
ENUM is a string object used to specify set of predefined values and that can be used during table creation.
Create table size(name ENUM('Small', 'Medium','Large')
Define REGEXP ?
REGEXP is a pattern match in which matches pattern anywhere in the search value.
Difference between CHAR and VARCHAR?
Following are the differences between CHAR and VARCHAR:
- CHAR and VARCHAR types differ in storage and retrieval
- CHAR column length is fixed to the length that is declared while creating table. The length value ranges from 1 and 255
- When CHAR values are stored then they are right padded using spaces to specific length. Trailing spaces are removed when CHAR values are retrieved.
Give string types available for column?
The string types are:
- SET
- BLOB
- ENUM
- CHAR
- TEXT
- VARCHAR